00:01
To determine the molar mass of anything, we need to know two things.
00:04
We need to know the mass of the substance, and we need to know the corresponding moles of the substance.
00:10
To calculate the corresponding moles, we recognize that it's being titrated with sodium hydroxide.
00:17
Because it's monoprotic, one -mole sodium hydroxide, will react with one -mole ha in order to produce its conjugate base and water.
00:25
So we can calculate the moles of the acid, knowing the moles of sodium hydroxide that were added.
00:36
Then the molar mass will be equal to the mass of the acid divided by the moles of the acid.
00:50
The mass of the acid, you have 0 .2562 grams.
00:58
We'll divide that by the moles, which can be calculated from the moles of the.
01:03
Sodium hydroxide added.
01:06
So it looks like there's a typo.
01:07
You've got 3 .55 and 3 .55 for both the initial and the final volume.
01:14
Let's assume that the change in volume from your burette is 3 .55 milliliters...